... Sclerotinia minor is a major pathogen of peanut in North Carolina, Virginia, Oklahoma, and Texas. Partial resistance to S. minor has been reported based on field screening, but field performance is not always correlated with laboratory or greenhouse evaluations of resistance. More efficient screening methods and better understanding of the mechanisms contributing to Sclerotinia blight resistance a ...

... During 2001, branch dieback, black trunk rot, and resinosis were observed on mesquite in the biosphere reserve of Tehuacan, Mexico (18°15′N, 97°25′W) A light brown growth, which included Nodulosporium-like conidiosphores and hyaline conidia that were green in mass and ellipsoid with one end truncate developed on diseased branches. Below the conidiophores and conidia, glomerate to pulvinate stromat ...

... Beginning in the summer of 1996, a disease of high-bush blueberry (Vaccinium corymbosum L.) appeared on cvs. Sparta and Berkeley in commercial plantings near Cuneo and in a nursery in Pinerolo (northwest Italy). In the field, the disease became evident 5 to 8 months after planting. Symptoms included stunting, pale green-to-reddish leaves, premature defoliation, and root and crown rot. The root sys ...

... Norway maple (Acer platanoides L.) was introduced into the continental United States around 1756 as a street tree (2). It is a widely planted shade tree in the northern United States and Canada due to its fast growth rate when young and its tolerance of pavement and dry soils. Powdery mildew is common on Norway maple in Europe with records from at least 22 countries according to the databases of t ...

... Brassidium hybrid orchid leaves were sent to the University of Florida Plant Disease Clinic in the summer of 2002. Symptoms on leaves were a spreading, cottony, white mass of mycelium with necrotic centers 3 to 5 × 5 to 9 mm. Approximately 1% of leaves submitted were affected. Sclerotium rolfsii Sacc. was isolated from the affected leaves using acid potato dextrose agar (APDA) (1). Two plastic box ...

... In August 2002, soybean (Glycine max (L.) Merr.) plants exhibiting foliar and root symptoms typical of sudden death syndrome were observed in Blue Earth and Steele counties in south-central Minnesota. Leaf symptoms ranging from small chlorotic spots to prominent interveinal necrosis were present on soybean plants at the R6 to R7 growth stage. As plants matured, complete defoliation took place with ...

... Glucosinolates contained in members of the Brassicaceae release isothiocyanates potentially useful in controlling Fusarium oxysporum pathogens in conifer seedling nursery soils. Our objective was to determine the toxicity of individual isothiocyanates to different growth stages of the fungus. Bioassays with four F. oxysporum isolates were conducted using sealed containers in which 0.3 μl of 2-prop ...

... The occurrence of Botrytis cinerea and subsequent disease expression at different positions on leaves and bunches of grape was determined from 1996 to 2000. Different techniques were used to detect viable inoculum on material obtained from table (cvs. Barlinka and Dauphine) and wine grape (cv. Merlot) vineyards. Isolations were made from berry skins on Kerssies' B. cinerea selective medium or on w ...

... A dieback associated with resinous branch and main stem cankers was observed on two spruce pine (Pinus glabra Walt.) trees in Lee County, Alabama in July 2002. Xylem tissues beneath the cankers were resinsoaked as is characteristic of pitch canker on other southern pine species. Surface-sterilized stem pieces from the canker margins were transferred to acidified potato dextrose agar and incubated ...